Updated save took to use settings

- moved text into app.js options object
- fixed events.js passing in this.settings instead of this.options
- added in short-circut in renderSave if current user is same as assignee
- added in short-circut in renderSave if preventAssignOOO is false
- created 'update_warning' event to handle the services.notify stuff

TODO:
  bind to 'update_warning' and create the message
Merge branch 'j/84' of github.com:ZendeskES/out-of-office-app into j/84

Conflicts:
	app.js